Draconinc Heritage
When available, a Dragonborn spontaneous caster (such as a sorceror) may attempt to cast a spell of a spell level that has no remaining spell slots. Once the casting time is completed, he rolls a d6: on a 1, 2 or 3, he successfully casts the spell and Draconinc Heritage remains available. On a 4, 5 or 6, the spell fails, and Draconic Heritage becomes unavailable until he recovers his spell slots.

Draconic Immunities
Dragonborn are immune to sleep effects.

Elemental Resistance
Dragonborn gain resistance 5 to the element of their breath weapon and heritage,
either acid, cold, electricity or fire.